 
	<style type="text/css">
		
		.container-box{
			height: 100vh;
		}
		.bootstrap-headerbox{
			position: relative;
			height: 10%;
			background-color: #666;
		}
		.leftbox,.rightbox{
			float: left;
			width: 50%;
			height: 90%;
		}
		.leftbox{
			background-color: #888;
		}
		.rightbox{
			background-color: #999;
		}
	</style>


	<!-- bootstrap / 导航栏布局 start-->
	<div class="container-box">
		<div class="bootstrap-headerbox">
			<!-- 嵌入bootstrap框架的导航栏组件 -->
			<!--框架的组件文档 "https://getbootstrap.net/docs/components/navbar/"-->
			<nav class="navbar navbar-expand-lg navbar-dark bg-dark" style="min-height: 100%">
				<a class="navbar-brand" href="#">
					系统名称
				</a>
				<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent">
	    			<span class="navbar-toggler-icon"></span>
	  			</button>

				<div class="collapse navbar-collapse" id="navbarSupportedContent">
					<ul class="navbar-nav mr-auto" >
						<li class="nav-item">
							<a class="nav-link active" href="#">菜单项1</a>
						</li>
						<li class="nav-item">
							<a class="nav-link" href="#">菜单项2</a>
						</li>
						<li class="nav-item dropdown">
							<a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">菜单项3</a>
							<div class="dropdown-menu">
								<a class="dropdown-item" href="#">子菜单1</a>
								<a class="dropdown-item" href="#">子菜单2</a>
								<a class="dropdown-item" href="#">子菜单3</a>
								<a class="dropdown-item" href="#">子菜单4</a>
							</div>
						</li>
					</ul>
					<form class="form-inline">
				      <input class="form-control mr-2" type="search" placeholder="搜索" aria-label="Search" style="width: 70%">
				      <button class="btn btn-outline-light" type="submit" >搜索</button>
				    </form>
				</div>
			</nav>
			<!-- bootstrap框架的导航栏组件结束 -->
		</div>


		<!-- 左侧内容区域 -->
		<div class="leftbox">

			
		</div>

		
		<!-- 右侧内容区域 -->
		<div class="rightbox">

			
		</div>
	</div>
	
	<script type="text/javascript">
		//取得搜索栏的节点对象
		var seachValue=document.querySelector(".form-inline .form-control");
		//取得搜索按钮的节点对象
		var submit=document.querySelector(".form-inline button[type='submit']");
		//点击搜索按钮触发
		submit.onclick=function(event){
			var event=event||window.event;
			event.preventDefault();//取消默认行为
			console.log('搜索按钮被触发');
			console.log(seachValue.value);//输出搜索框的值
		}

		//获取导航栏的点击项
		var navitem=$(".navbar-nav .nav-item");
		navitem.click(function(){
			console.log($(this).index());
			//利用addClass()、removeClass()来控制当前点击项的样式。
			//siblings()可获取当前点击项的其他兄弟元素
			//$(this).children('a').addClass('active')
			//$(this).siblings().children('a').removeClass('active');
		});
	</script>
	<!-- bootstrap / 导航栏布局 end-->